The Wall Street Journal reported that approximately 25% of the people who are told a product is improved will believe that it is, in fact, improved. The remaining 75% believe that this is just hype (the same old thing with no real improvement). Suppose a marketing study consists of a random sample of seven people who are given a sales talk about a new, improved product.

(a) Make a histogram showing the probability that r = 0 to 5 people believe the product is, in fact, improved.